what she wants to know is which dress she should buy是个什么从句,并帮我分析下 主语从句还是表语从句?

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what she wants to know is which dress she should buy是个什么从句,并帮我分析下 主语从句还是表语从句?
what she wants to know is which dress she should buy
是个什么从句,并帮我分析下
主语从句还是表语从句?

what she wants to know is which dress she should buy是个什么从句,并帮我分析下 主语从句还是表语从句?
主语从句,及表语从句.
(what she wants to know)is [which dress she should buy].
()中的完整句子作为后面句子的主语,叫做主语从句.
[]中的完整句子,作为系动词is的表语,叫做表语从句.
译为:她想知道的是她该买哪条裙子.
所以,本句存在两个从句.主语和表语均用从句表示.

What引导的主语从句.
主语:what she wants to know
系动词is
which dress she should buy充当表语.

主语:what she wants to know (what引导主语从句在整句话中作主语)
谓语动词:is
宾语: which dress she should buy(which引导宾语从句)
句意:她想知道的是她该买哪一条裙子。

宾语从句
改成肯定句是
she wants to know which dress she should buy
know后面是宾语, 问句是对which...提问